 /* 左边框导航栏 */
  /* 内容 */
  #center{
    width: 1600px;
    height: 700px;
  }
        /* 左边框 */
        #c-left{
            width: 250px;
            height: 700px;
            border: px solid white;
            background-color: #2b2b2b;
            border-right:2px solid gray;
            padding-left: 10px;
            overflow: hidden;
             float: left;}
      

 #c-left li{
    width: 250px;
    height: 30px;
    color: #f2f2f2;
     list-style: none;
     font-size: 20px;
     text-align: left;
     padding-top: 5px;
    margin-top: 10px;

      font-weight: 500;
      text-align: justify;
      
 }
 #c-left li:hover{
    color: white;
    background-color: gray;
    border-radius: 10px;
 }


 #c-left p{
     padding-top: 20px;
     color: gray;
     cursor: pointer;
 }